Spirent TestCenter is a network testing solution designed to simulate and analyze network traffic in various network environments. It is commonly used by network engineers, testers, and developers to validate the performance, scalability, and reliability of network devices and infrastructure. Here's how Spirent TestCenter works:
1. **Traffic Generation**: Spirent TestCenter can generate various types of network traffic, including Layer 2 (Ethernet), Layer 3 (IP), Layer 4 (TCP/UDP), and Layer 7 (application-level) traffic. Users can configure traffic profiles, such as packet size, rate, protocols, and traffic patterns, to simulate real-world network conditions and traffic scenarios.
2. **Topology Configuration**: Users can create complex network topologies using Spirent TestCenter's graphical user interface (GUI) or scripting capabilities. The tool supports a wide range of network protocols and technologies, including Ethernet, VLANs, IP, MPLS, BGP, OSPF, and more. Users can define the layout of network devices, connections, and traffic flows within the test environment.
3. **Traffic Monitoring**: Spirent TestCenter provides real-time monitoring and analysis capabilities to capture and analyze network traffic. Users can view detailed statistics, performance metrics, and traffic patterns to assess the behavior and performance of network devices under test (DUTs). The tool offers various visualization tools, including charts, graphs, and histograms, to visualize traffic data and identify potential issues.
4. **Protocol Emulation**: Spirent TestCenter can emulate various network protocols and behaviors to simulate real-world network conditions. Users can configure protocol-specific parameters, behaviors, and configurations to emulate different network scenarios and test the interoperability and compatibility of network devices and protocols.
5. **Scalability Testing**: Spirent TestCenter supports testing at scale by allowing users to generate large volumes of traffic and emulate thousands or even millions of concurrent connections. This enables users to assess the scalability, capacity, and performance limits of network devices, such as switches, routers, firewalls, and load balancers.
6. **Automation and Scripting**: Spirent TestCenter offers extensive automation capabilities through scripting interfaces (such as Python and Tcl) and integration with test automation frameworks. Users can automate test scenarios, configure test setups programmatically, and integrate testing into continuous integration (CI) and continuous deployment (CD) pipelines.
Overall, Spirent TestCenter provides a comprehensive set of tools and features for network testing, validation, and performance analysis. It enables users to create realistic network environments, generate diverse traffic patterns, analyze network behavior, and assess the performance and reliability of network devices and infrastructure under various conditions.
Real-time capture is possible with only STC version of wireshark.
Break port test is possible only under port.
Raw and bound is customed traffic.
For configuring flows, we need to enable BFDS.
.tcc config can be used as .db
Single device can run multiple protocols same time.
TCP, ARP are emulated frames. Test frames contain signature field.
On the fly while running the test u can change load profile
Control plane packets will capture both send and rx packets in wireshark.
One test profile can have 4000 streamblocks
Hypermetrics CM module can have 32000 streams.
Each modifier can have one stream or the same modifier can be used for multiple streams.
Use streams option will create a separate stream for each variation.
Signature filed is used to track the frames in term of streams, sequencing of packets and latency information.
Each analyzer can analyze up to 64000 streams.
Control plane statistics: data which is generated by CPU like ARP, ICMP,PPP
STC software and firmware version must match.
Single port reservation is possible in case of 10GE port or HM CM module having version > 3.3X otherwise ports are reserved in multiple of two.
Individual ARP request result can be viewed under port traffic and counters -> arp nd results.
In bound stream, by default traffic is port based. Port-based mode means traffic will be shared.
By default analyzer set to analyze everything but it's basically looking for the stream ID.
Analyzer preload is new feature added in 3.50 version. It has an ability to detect dead streams and will know what kind of traffic to expect.This option is enabled under stream block.
Command sequencer record mode is a new feature added in STC in 3.50 version.
We cannot record conditional loops in command seq record mode.
An analyzer can distinguish between duplicate frames.
Real-time results refresh in 1 sec
Histogram – bucket histogram mode means basic sequencing.
Results mode can be changed in settings as well as in result pane.
In histogram mode, the only support is latency.
Use streams is equivalent to traffic streams in traffic wizard
Results are overwritten everytime you save the file though STC will ask for the popup option to do so.
Port analyzer default filter is stream ID.
PGA requires PGA base package license.
To run batch mode, we use custom test wizard
A single port can have 32K devices.
Can have 4000 stream blocks profiles per test.
Devices and routes can be mixed in single stream block or port.
Raw and bound stream blocks can be mixed in single test.
Each port can provide counts and rates for 32K streams
Advantage of lab server:
-one tcp connection only
-more session based on the number of user connected.
-for overnight test.
Use of raw streams block:
-to create bad traffic
-want to simply send traffic irrespective of destinations.
The default ToS/DiffServ on Raw Stream block is 00 while the Bound Stream block is C0.
All packets associated with one particular steam have a signature field with the same stream ID.
Signature field is 20 bytes
How to make DUT as dhcp server
Config t
# ip dhcp pool spirent
# network 1.1.1.0 255.255.255.0
R# show ip dhcp bindings
Clear ip dhcp binding *
Stc can be configured as dhcp client or server .
Dhcp client : cisco router
#int g0/2
Ip dhcp client class-id abc
OSpf config in DUT
Ospf :
Router ospf 1
Network 192.168.11.0 0.0.0.255 area 0
Network 192.168.12.0 0.0.0.255 area 0
Show ip route
Show ip ospf int
Show ip ospf neighbor
Bigger the frame size, more is the latency but there will be less no of drops since the router has to process fewer packets.
BGP config in DUT.
BGP :
Router bgp 100
Neighbor 1.1.1.2 remote as 200
Neighbor 2.2.2.2 remote as 300
Show ip route
Show ip bgp summary
Show ip bgp
Show ip bgpo neighbors
4 byte as no is used if there are many AS numbers.
2 management ports in present in 9U Chasis.
AC failure means power cable is not connected. DC failure means AC power is not converted into DC power. This could be a serious issue.
In avalanche you need to install the license in your pc for the application you are running.
In STC one time the only license need to be installed.
CPU 5002A modules: each 8 port act as individual port: 8 core : default profile is l4/l7
CM modules: there are 4 port groups. Each port groups contains 2 ports. default is stc . Need to install l4/l7 package
DX : 4 port groups : 10 Gbps*4 = 40 Gbps
DX2 is single slot with 32 ports.
CM – 1G – D4 == dual 4 ports. 2 port groups. Dual == optical + electrical
If you are running through wizards, capture is disabled, you need to run manually for capture but through script it is possible.
Simple raw traffic is called data traffic.
Anything with routing and other protocols is called: control traffic
RFC 2544: benchmarking for network interconnected devices. L2/L3 switches
RFC 2889: Benchmarking Methodology for LAN Switching devices
RFC 2889: Methodology for IP Multicast Benchmarking
Spirent TestCenter is fully interactive: Control and data plane parameters can be changed dynamically, and real-time feedback can be received. All tests can be saved as configuration files for simplified test automation.
There are two classes of Spirent TestCenter packages:
-The Base packages provide software for testing network protocols.
-The Test packages provide software for testing based on well-defined test methodologies that are either RFC-based standards or developed by Spirent in working with its customers
Break port test is possible only under port.
Raw and bound is customed traffic.
For configuring flows, we need to enable BFDS.
.tcc config can be used as .db
Single device can run multiple protocols same time.
TCP, ARP are emulated frames. Test frames contain signature field.
On the fly while running the test u can change load profile
Control plane packets will capture both send and rx packets in wireshark.
One test profile can have 4000 streamblocks
Hypermetrics CM module can have 32000 streams.
Each modifier can have one stream or the same modifier can be used for multiple streams.
Use streams option will create a separate stream for each variation.
Signature filed is used to track the frames in term of streams, sequencing of packets and latency information.
Each analyzer can analyze up to 64000 streams.
Control plane statistics: data which is generated by CPU like ARP, ICMP,PPP
STC software and firmware version must match.
Single port reservation is possible in case of 10GE port or HM CM module having version > 3.3X otherwise ports are reserved in multiple of two.
Individual ARP request result can be viewed under port traffic and counters -> arp nd results.
In bound stream, by default traffic is port based. Port-based mode means traffic will be shared.
By default analyzer set to analyze everything but it's basically looking for the stream ID.
Analyzer preload is new feature added in 3.50 version. It has an ability to detect dead streams and will know what kind of traffic to expect.This option is enabled under stream block.
Command sequencer record mode is a new feature added in STC in 3.50 version.
We cannot record conditional loops in command seq record mode.
An analyzer can distinguish between duplicate frames.
Real-time results refresh in 1 sec
Histogram – bucket histogram mode means basic sequencing.
Results mode can be changed in settings as well as in result pane.
In histogram mode, the only support is latency.
Use streams is equivalent to traffic streams in traffic wizard
Results are overwritten everytime you save the file though STC will ask for the popup option to do so.
Port analyzer default filter is stream ID.
PGA requires PGA base package license.
To run batch mode, we use custom test wizard
A single port can have 32K devices.
Can have 4000 stream blocks profiles per test.
Devices and routes can be mixed in single stream block or port.
Raw and bound stream blocks can be mixed in single test.
Each port can provide counts and rates for 32K streams
Advantage of lab server:
-one tcp connection only
-more session based on the number of user connected.
-for overnight test.
Use of raw streams block:
-to create bad traffic
-want to simply send traffic irrespective of destinations.
The default ToS/DiffServ on Raw Stream block is 00 while the Bound Stream block is C0.
All packets associated with one particular steam have a signature field with the same stream ID.
Signature field is 20 bytes
How to make DUT as dhcp server
Config t
# ip dhcp pool spirent
# network 1.1.1.0 255.255.255.0
R# show ip dhcp bindings
Clear ip dhcp binding *
Stc can be configured as dhcp client or server .
Dhcp client : cisco router
#int g0/2
Ip dhcp client class-id abc
OSpf config in DUT
Ospf :
Router ospf 1
Network 192.168.11.0 0.0.0.255 area 0
Network 192.168.12.0 0.0.0.255 area 0
Show ip route
Show ip ospf int
Show ip ospf neighbor
Bigger the frame size, more is the latency but there will be less no of drops since the router has to process fewer packets.
BGP config in DUT.
BGP :
Router bgp 100
Neighbor 1.1.1.2 remote as 200
Neighbor 2.2.2.2 remote as 300
Show ip route
Show ip bgp summary
Show ip bgp
Show ip bgpo neighbors
4 byte as no is used if there are many AS numbers.
2 management ports in present in 9U Chasis.
AC failure means power cable is not connected. DC failure means AC power is not converted into DC power. This could be a serious issue.
In avalanche you need to install the license in your pc for the application you are running.
In STC one time the only license need to be installed.
CPU 5002A modules: each 8 port act as individual port: 8 core : default profile is l4/l7
CM modules: there are 4 port groups. Each port groups contains 2 ports. default is stc . Need to install l4/l7 package
DX : 4 port groups : 10 Gbps*4 = 40 Gbps
DX2 is single slot with 32 ports.
CM – 1G – D4 == dual 4 ports. 2 port groups. Dual == optical + electrical
If you are running through wizards, capture is disabled, you need to run manually for capture but through script it is possible.
Simple raw traffic is called data traffic.
Anything with routing and other protocols is called: control traffic
RFC 2544: benchmarking for network interconnected devices. L2/L3 switches
RFC 2889: Benchmarking Methodology for LAN Switching devices
RFC 2889: Methodology for IP Multicast Benchmarking
Spirent TestCenter is fully interactive: Control and data plane parameters can be changed dynamically, and real-time feedback can be received. All tests can be saved as configuration files for simplified test automation.
There are two classes of Spirent TestCenter packages:
-The Base packages provide software for testing network protocols.
-The Test packages provide software for testing based on well-defined test methodologies that are either RFC-based standards or developed by Spirent in working with its customers
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